Hello, i need your feedback about the simulation of a 3 dimensional flow around a cylinder or a NACA-profile with the CompressibleFlowSolver of the NavierStokesCFE or the EulerCFE. In every case the simulation starts, but always ends at the point of "Writing: "file_0.chk" " due to time-limit of the Cluster (limited to 1 day). I tried several times. The parameters, Solver Info and so on were shown (see below). In 2D there is not such a problem. So my question is, if it depends on the calculation capacity (CPU etc.) or what the reason for this? Actually iam calculating on a Cluster with 10 nodes and 120 CPUs. I think, that the calculation normally should be faster and another time-step should be done after one day or is it normal to a 3D-simulation with the compressible solver? So please can you give me an advice about the Problem? For example the 3D-problem of the cylinder with the CompressibleFlowSolver with the NavierStokesCFE produces this output after one day of calculation: (The example with the cylinder is exact the same you published at this page: http://www.nektar.info/compressible-flow/ ) Parameters: ALPHA = 0 CINF = 294.827 CP = 1004.7 FINTIME = 2 GAMMA = 1.4 GASCONSTANT = 287.058 IO_CHECKSTEPS = 50000 IO_INFOSTEPS = 1 KAPPA = 0.1 L = 1 MACH = 0.1 MU = 0.00275172 MU0 = 0.5 NUMSTEPS = 2e+06 PINF = 22600 PR = 0.72 RE = 3900 RHOINF = 0.364 SKAPPA = -2.3 THERMALCONDUCTIVITY = 3.83981 TIMESTEP = 1e-06 TINF = 216.29 TWALL = 216.29 UINF = 29.4827 VINF = 0 WINF = 0 Solver Info: ADVECTIONTYPE = WeakDG DIFFUSIONTYPE = LDGNS DRIVER = Standard EQTYPE = NavierStokesCFE EVOLUTIONOPERATOR = Nonlinear GLOBALMATRIXSTORAGETYPE = SmvBSR GLOBALSYSSOLN = IterativeStaticCond LINEARPRECONSOLVER = Xxt LOCALMATRIXSTORAGESTRATEGY = Sparse PRECONDITIONER = Diagonal PROBLEMTYPE = General PROJECTION = DisContinuous TIMEINTEGRATIONMETHOD = RungeKutta2_ImprovedEuler UPWINDTYPE = ExactToro VISCOSITYTYPE = Variable gs_setup: 240784 unique labels shared pairwise times (avg, min, max): 0.000148432 0.000120687 0.000157881 crystal router : 0.000947791 0.000929117 0.000967693 used all_to_all method: pairwise handle bytes (avg, min, max): 241216 152740 313476 buffer bytes (avg, min, max): 160523 101632 208640 gs_setup: 1187072 unique labels shared pairwise times (avg, min, max): 0.000483757 0.000410008 0.000513387 crystal router : 0.0109781 0.0108864 0.01108 used all_to_all method: pairwise handle bytes (avg, min, max): 1.18751e+06 656164 1481220 buffer bytes (avg, min, max): 791381 437248 987136 gs_setup: 240784 unique labels shared pairwise times (avg, min, max): 0.000113803 9.51052e-05 0.000123191 crystal router : 0.000868803 0.000849199 0.000890398 used all_to_all method: pairwise handle bytes (avg, min, max): 241216 152740 313476 buffer bytes (avg, min, max): 160523 101632 208640 gs_setup: 1187072 unique labels shared pairwise times (avg, min, max): 0.000463862 0.000412512 0.000496101 crystal router : 0.00953256 0.00941629 0.0096302 used all_to_all method: pairwise handle bytes (avg, min, max): 1.18751e+06 656164 1481220 buffer bytes (avg, min, max): 791381 437248 987136 gs_setup: 240784 unique labels shared pairwise times (avg, min, max): 0.000115333 9.5892e-05 0.000125098 crystal router : 0.00325584 0.0032357 0.0032764 used all_to_all method: pairwise handle bytes (avg, min, max): 241216 152740 313476 buffer bytes (avg, min, max): 160523 101632 208640 gs_setup: 1187072 unique labels shared pairwise times (avg, min, max): 0.00103487 0.00097959 0.00105419 crystal router : 0.00855757 0.00837069 0.0108672 used all_to_all method: pairwise handle bytes (avg, min, max): 1.18751e+06 656164 1481220 buffer bytes (avg, min, max): 791381 437248 987136 gs_setup: 240784 unique labels shared pairwise times (avg, min, max): 0.000114435 8.49009e-05 0.000136399 crystal router : 0.00204957 0.0020185 0.00207429 used all_to_all method: pairwise handle bytes (avg, min, max): 241216 152740 313476 buffer bytes (avg, min, max): 160523 101632 208640 gs_setup: 1187072 unique labels shared pairwise times (avg, min, max): 0.000471148 0.0004215 0.000498414 crystal router : 0.00977638 0.0085747 0.0109815 used all_to_all method: pairwise handle bytes (avg, min, max): 1.18751e+06 656164 1481220 buffer bytes (avg, min, max): 791381 437248 987136 gs_setup: 240784 unique labels shared pairwise times (avg, min, max): 0.000113707 9.59873e-05 0.000121403 crystal router : 0.000872626 0.000852704 0.00089221 used all_to_all method: pairwise handle bytes (avg, min, max): 241216 152740 313476 buffer bytes (avg, min, max): 160523 101632 208640 gs_setup: 1187072 unique labels shared pairwise times (avg, min, max): 0.000467315 0.000390005 0.000493503 crystal router : 0.010846 0.0107322 0.0109444 used all_to_all method: pairwise handle bytes (avg, min, max): 1.18751e+06 656164 1481220 buffer bytes (avg, min, max): 791381 437248 987136 ======================================================================= EquationType: NavierStokesCFE Session Name: Cylinder_NS_3D Spatial Dim.: 3 Max SEM Exp. Order: 4 Expansion Dim.: 3 Riemann Solver: ExactToro Advection Type: Projection Type: Discontinuous Galerkin Diffusion Type: Advection: explicit AdvectionType: WeakDG Diffusion: explicit Time Step: 1e-06 No. of Steps: 2000000 Checkpoints (steps): 50000 Integration Type: RungeKutta2_ImprovedEuler Problem Type: General ======================================================================= Initial Conditions: - Field rho: rhoInf - Field rhou: rhoInf * uInf - Field rhov: rhoInf * vInf - Field rhow: rhoInf * wInf - Field E: pInf / (Gamma - 1) + 0.5 * rhoInf * (uInf * uInf + vInf * vInf + wInf * wInf) Writing: "Cylinder_NS_3D_0.chk" slurmstepd: *** JOB 930941 CANCELLED AT 2016-07-06T03:27:36 DUE TO TIME LIMIT *** I run the solver by: "mpirun -np 120 CompressibleFlowSolver -v 3D_cylinder_mesh.xml 3D_cylinder_conditions.xml" Thanks for any hint. If you need more information, please let me know . Best regards Fabian Selbach University of Siegen